text stringlengths 1 1.32M |
|---|
b Carefully cut another very small piece of sodium Using a deflagrating spoon introduce it to a Bunsen flame When it catches fire lower it slowly into a gas jar containing Oxygen |
Place about 20 cm3 of water into the gas jar Test the solutionmixture using litmus papers Test the solutionmixture using litmus papers |
Observations |
aIn air |
Sodium burns with a yellow flame in air forming a black solid Blue litmus paper remains blue Red litmus paper turns blue |
b In pure Oxygen |
Sodium burns faster with a golden yellow flame in pure oxygen forming a yellow solid Effervescencebubbles fizzing Gas produced relights glowing splint Blue litmus paper remains blue Red litmus paper turns blue |
Explanation |
aSodium burns in air forming black Sodium Oxide |
Chemical equations |
Sodium Oxygenair Sodium Oxide |
4Nas O2 g 2Na2Os |
Sodium Oxide dissolves in water to form a basicalkaline solution of Sodium hydroxide |
Chemical equations |
Sodium Oxide Water Sodium hydroxide |
Na2Os H2O l 2NaOH aq |
bSodium burns in pure oxygen forming yellow Sodium peroxide |
Chemical equations |
Sodium Oxygen Sodium peroxide |
2Nas O2 g Na2O2 s |
Sodium peroxide dissolves in water to form a basicalkaline solution of Sodium hydroxide Oxygen is produced |
Chemical equations |
Sodium Oxide Water Sodium hydroxide Oxygen |
2Na2O2 s 2H2O l 4NaOH aq O2 l |
III Burning Calcium |
Procedure |
aUsing a pair of tongs hold the piece of calcium on a bunsen flame |
Observe |
Place the products in a beaker containing about 2cm3 of water Test the solutionmixture using litmus papers |
bUsing a pair of tongs hold another piece of calcium on a Bunsen flame Quickly lower it into a gas jar containing Oxygen gas Observe |
Place about 2cm3 of water Swirl |
Test the solutionmixture using litmus papers |
Observations |
aIn air |
Calcium burns with difficulty producing a faint red flame in air forming a white solid Blue litmus paper remains blue Red litmus paper turns blue |
b In pure Oxygen |
Calcium burns with difficulty producing a less faint red flame Oxygen forming a white solid Blue litmus paper remains blue Red litmus paper turns blue |
Explanation |
aCalcium burns in air forming white calcium Oxide Calcium Oxide coatcover the calcium preventing further burning |
Chemical equations |
Calcium Oxygenair calcium Oxide |
2Cas O2g 2CaOs |
Small amount of Calcium Oxide dissolves in water to form a basicalkaline solution of Calcium hydroxide The common name of Calcium hydroxide is lime water |
Chemical equations |
Calcium Oxide Water Calcium hydroxide |
CaOs H2O l Ca OH 2 aq |
IV Burning Iron |
Procedure |
aUsing a pair of tongs hold the piece of Iron woolsteel wire on a Bunsen flame |
Observe |
Place the products in a beaker containing about 2cm3 of water Test the solutionmixture using litmus papers |
bUsing a pair of tongs hold another piece of Iron woolsteel wire on a Bunsen flame |
Quickly lower it into a gas jar containing Oxygen gas Observe |
Place about 2cm3 of water Swirl Test the solutionmixture using litmus papers |
Observations |
aIn air |
Iron woolsteel wire burns producing an Orange flame in air forming a brown solid Blue litmus paper remains blue Red litmus paper turns faint blue |
b In pure Oxygen |
Iron woolsteel wire burns producing a golden Orange flame in Oxygen forming a Brown solid Blue litmus paper remains blue Red litmus paper turns faint blue |
Explanation |
aIron burns in air forming brown Iron III Oxide |
Chemical equations |
Iron Oxygenair Iron III Oxide |
4Fes 3O2 g 2Fe2O3s |
Very small amount of Iron III Oxide dissolves in water to form a weakly basicalkaline brown solution of Iron III hydroxide |
Chemical equations |
Calcium Oxide Water Iron III hydroxide |
Fe2O3s 3H2O l 2Fe OH 3 s |
V Burning Copper |
Procedure |
aUsing a pair of tongs hold the piece of copper turningsshavings on a Bunsen flame |
Observe |
Place the products in a beaker containing about 2cm3 of water Test the solutionmixture using litmus papers |
bUsing a pair of tongs hold another piece of Copper turningsshavings on a Bunsen flame Quickly lower it into a gas jar containing Oxygen gas Observe |
Place about 2cm3 of water Swirl Test the solutionmixture using litmus papers |
Observations |
aIn air |
Copper turningsshavings burns with difficulty producing a green flame in air forming a black solid Blue litmus paper remains blue Red litmus paper turns faint blue |
b In pure Oxygen |
Copper turningsshavings burns less difficulty producing a green flame in Oxygen forming a Brown solid Blue litmus paper remains blue Red litmus paper turns faint blue |
Explanation |
aCopper burns in air forming black Copper II Oxide |
Chemical equations |
Copper Oxygenair Copper II Oxide |
2 Cus O2 g 2CuOs |
Very small amount of Copper II Oxide dissolves in water to form a weakly basicalkaline blue solution of Copper II hydroxide |
Chemical equations |
Copper II Oxide Water Copper II hydroxide |
CuOs H2O l Cu OH 2 s |
iReaction of non metals with Oxygenair |
The following experiments show the reaction of non metals with Oxygen and air |
I Burning Carbon |
Procedure |
aUsing a pair of tongs hold a dry piece of charcoal on a Bunsen flame |
Observe |
Place the products in a beaker containing about 2cm3 of water Test the solutionmixture using litmus papers |
bUsing a pair of tongs hold another piece of dry charcoal on a Bunsen flame Quickly lower it into a gas jar containing Oxygen gas Observe |
Place about 2cm3 of water Swirl Test the solutionmixture using litmus papers |
Observations |
Carbon chars then burns with a blue flame |
Subsets and Splits
No community queries yet
The top public SQL queries from the community will appear here once available.